Down here the G5 is about $100NZD more than a mac mini, plus finding one locally with an ATI card is near impossible. They all have Nvidia cards which of course MorphOS doesn't like.
So I looked at buying an ATI card and the prices were expensive :-(
I also notice that anything including and above the ATI Radeon 9550 doesn't support W3D.
Im in the same seat, ive had my Mac mini 1.52GHz with 32MB vram and morphOS for a long time but I recently wanted to give the Power mac a go but where I live G5 power macs go for 600$+ and it feels a bit to much :/ The G4 ones go for next to nothing tho so might pickup and try one of those instead

Not to complain the Mac mini is sufficient enough but I want to be able to expand more

Edit: Maybe you where talking about laptops?